The role of Fabry–Perot resonance for a periodic array of gold nano-slits

Abstract

Comprehensive investigations of electromagnetic enhancement and transmittance by a periodic array of gold nano-slits are presented. Rigorous numerical data can be well predicted by a simple Fabry–Perot model. By virtue of the model, the role of Fabry–Perot resonance that enables giant electromagnetic enhancement and high transmittance by a gold nano-slit array is studied. Distinct impacts of array period and slit width on electromagnetic enhancement and those on transmittance are explored. Numerical results imply that contributions of electromagnetic enhancement and transmittance should be considered together in determining the actual enhanced effect of sample signals in surface-enhanced Raman scattering application.

Keywords:

• Surface-enhanced Raman scattering
• gold nano-slit array
• Fabry–Perot resonance
• electromagnetic enhancement

Funding

This work is financially supported by the Natural Science Foundation of Tianjin, China [grant number 14JCQNJC01900]; Tianjin University Science & Technology Development Fund Project [grant number 20130904], [grant number 20120907]; National Natural Science Foundation of China [grant number 11204214].

Disclosure statement

No potential conflict of interest was reported by the authors.